#ifndef VIETER_CRON
#define VIETER_CRON

#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

typedef enum cron_parse_error {
	cron_parse_ok = 0,
	cron_parse_invalid_expression = 1,
	cron_parse_invalid_number = 2,
	cron_parse_out_of_range = 3,
	cron_parse_too_many_parts = 4,
	cron_parse_not_enough_parts = 5
} cron_parse_error;

typedef struct cron_expression {
	uint8_t *minutes;
	uint8_t *hours;
	uint8_t *days;
	uint8_t *months;
	uint8_t minute_count;
	uint8_t hour_count;
	uint8_t day_count;
	uint8_t month_count;
} cron_expression;

typedef struct cron_simple_time {
	int year;
	int month;
	int day;
	int hour;
	int minute;
} cron_simple_time;

cron_expression *ce_init();

void cron_ce_free(cron_expression *ce);

void cron_ce_next(cron_simple_time *out, cron_expression *ce,
				  cron_simple_time *ref);

void cron_ce_next_from_now(cron_simple_time *out, cron_expression *ce);

enum cron_parse_error cron_ce_parse_expression(cron_expression *out,
											   const char *expression);

#endif